hermann



Patented July l9, I898.

]. E. HERMANN.

METAL BEATER HAMMER.

(Application filed July 17, 1897.)

2 Sheets-Sheet I.

(No Model.)

m: -om=|s PETERS cov PHOTOLIYHO, wasnmmun. n. c.

N0. 607,5). Patented July l9, I898.

l. E. HERMANN.

METAL BEATEB HAMMER.

(Application filed July IT, 1897.) {N0 Modem 2 Sheets-8heet 2.

N V WW/QMMM 5 Jttomzeys.

m: Norms PEYcRs ca. PHOYOilTHOWASWNf-TON n. c.

. are set studs g.

NITED STATES" PATENT FFICE.

JOHANN ERNST I-IERMANN, OF NEWV YORK, N. Y., ASSIGNOR TO GREMPLER &HERMANN, OF SAME PLACE.

M ETAL-BEATER HAM M ER.

$PEGJCFICATION forming part of Letters Patent NO. 607,510, dated July19, 1898.

Application filed July l7, 1897- 7 Serial No. 644,927. (No model.)

To all whom it may concern.-

Be it known that I, J OHANN ERNST HER- MANN, a subject of the Emperor ofGermany, and a resident of New York, (Brooklyn,) county of Kings, andState of New York, have invented certain new and useful Improvements inMetal-Beater Hammers, of which the following is a full, clear, and exactspecification, reference being had to the accompanying drawings, whereinFigure 1 is a front view, and Fig. 2 a side elevation, of my improvedhammer; Fig. 3, an enlarged detail showing the position of the operatingparts in the moment of striking. Fig. 4 is also an enlarged detail, asectional view on line 4 at, indicated in Fig. 1, showing the connectionbetween the hammer and the bow. 7

Similar letters of reference indicate corresponding parts in all viewsof the drawings.

Beating of metallic leaf is yet mostly done by hand, though by using apower-hammer the cost of producing could be very materially reduced. Thebeating requires a strike that might be described by the word springy, astrike that must be hard to have effect, and again not rigid to preventbeating of holes into the cutches or shoders. This peculiar strike canonly be produced by a skilled worker who has acquired this skill by longpractice and experience. Myinvention tends to provide a power-hammercapable of pro ducing this peculiar strike; and with this end in view myinvention consists of the hereinafter-described construction of ahammerframe and its combination with the hammer and with mechanism forimparting a motion thereto.

The frame consists of bow a, arms b, links 0, studs g, springs d,setters e, and set-screws f, and is secured by bolts h to cross-head i,sliding in dovetail groove 70, provided in standard Z. Cross-headt' isconnected by rod m, pivoted on stud m, to disk at, set on driving-shaft0, and guides the motion of the frame up and down. Hammer q is integralwith block 1 sliding in groove 79, and thus guiding its motion. In bothends of bow a They are secured by screwnuts g, holding also setters e inposition. These latter and also collars g are fixed to the studs 9,whereon are slid bushings p and springs d. The ends of springs cl aresecured in flanges p of the bushings p and in collars g Springs d musthave a wide clearance around the studs g and must not be closely wound,because friction would impair their action in the operation of thehammer. They must have the requisite tension to sustain hammer q in itsnormal position. (Shown in Fig. 1 of the drawings.) Setters e are fixedon the studs g, and therefore by turning these setters in the directionof the winding of these springs their ,coils will be compressed andtheir tension increased. I Thus springs clmay be set to operate hammersvarying in weight and also'adjusted to compensate for a moderate stretchof theflexible links a. justment is effected by turning screws f,passing through the screw-threaded abutments f and pressing againsttheir ends.

Bushings p are mounted loosely on studs g and arms I) are keyed thereto.They are bifurcated, and between the side bars thereof are set pins 1).Similar pins g are set in lugs g of the hammer q, and flexible links 0,connecting hammer q with the bow a, are wound over these pins. They mayconsist either of belt, as shown in the drawings, or of a number ofpivotally-joined metallic links, or they may be metallic springs orrubber bands of sufficient strength, the only requirement being thatthey be sufficiently flexible to readily yield to the motion of thehammer q and again to the reaction of the springs d, resisting to acertain degree or counterbalancing the force of its stroke.

Connecting-rod mis so adjusted that when the stud m is in its lowestposition hammer q, if held in its normal position relatively to the bowa, would be yet some distance from the upper surface of the package ofmaterial laid upon the anvil r to be beaten.

This ad- The hammer being moved up and down same effect upon thematerial as the strike of a hammer wielded by the hand of a skilfulgold-beater. The material, though hit with the full force inherent tothe hammer, will not be beaten through, because the resistance ofsprings cl, increasing in equal ratio as the hammer descends, willfinally overbalance its momentum, and thus limit its action toa certainpredetermined extent.

The action of the springs d in withdrawing the hammer from the metalbeaten is augmentcd by the action of the operating mechanism, drawingthe frame a upward again before the hammer reaches the lowest point ofits stroke. \Vhen the force of the downward stroke of the hammer isexpended, the reac tion of the springs a will tend to lift the hammerinto its normal position and thereby again increase its velocity andmomentum. The combined action of the springs and of the mechanismlifting the frame will extend the upward motion of the hammer, and thesubsequent reaction of the springs will again increase the effect of itsdownward stroke. Thus the force of the strike will gradually grow as theoperation progresses. This is an other important advantage of myimproved construction. By such growingincrease of the force of thestrike the manual action of a skilled gold-beateris yet more closelyimitated and the beatingbeing much faster and more forcible the productof this mechanical process will excelthe output of skilled manual laborboth qualitatively and quantitatively.

The operation of the hammer is started and stopped by treadle '6,connected by rod 5 to the mechanism operating clutch to, clutchingpulley o to shaft 0. This treadle is operated by foot and gives theoperator of the hammer the advantage of being able to use both hands formanipulating the package upon the anvil.

I claim as my invention and desire to secure by Letters Patent- 1. Aharness for apower-hammer, comprising a cross-head, a bow secured to thecrosshead, arms pivoted to the ends of the bow, flexible linksconnecting the hammer to the arms, tension-springs set on the pivots andacting upon the arms, and means for adjusting the tension on thesprings.

2. The combination with the driving mechanism of a power-hammer, of across-head mounted in guideways, secu red to the standard and pivotallyconnected to the connecting-rod; a harness comprising a bow, rigidlysecured to the cross-head, arms pivoted to the ends of the bow, springsset 011 the pivots and drawing the arms apart, a hammer integral with across-head sliding in guideways secured to the standard and of means forflexibly connecting the hammer to the arms.

In witness that I claim the improvements described in the foregoingspecification I have signed my name in the presence of two subscribingwitnesses.

J OIIANN ERNST IIERMANN.

Witnesses:

FRANCIS' W. GREMPLER, HENRY SCHREITER.

